apache-comnons系列之commons-cli1.4 学习笔记

apache-comnons系列之commons-cli1.4 学习笔记

概述

参考

https://segmentfault.com/a/1190000006795206

CommandLineParser

A class that implements the

CommandLineParser

interface can parse a String array according to the {@link Options} specified and return a {@link CommandLine}.

DefaultParser

Default parser.

Option

Describes a single command-line option. It maintains information regarding the short-name of the option, the long-name,

if any exists, a flag indicating if an argument is required for this option, and a self-documenting description of the option.

Options

Options represents a collection of {@link Option} objects, which describe the possible options for a command-line.

OptionGroup

A group of mutually exclusive options.

optionMap = new LinkedHashMap

测试

org.apache.commons.cli.OptionTest

opt—-the name of the option

longOpt—-the long representation of the option

argName—-the name of the argument for this option

description/required

numberOfArgs

the number of argument values this option can have

valuesep

the character that is the value separator

List values = new ArrayList();—-the list of argument values

acceptsArg

Tells if the option can accept more arguments.

org.apache.commons.cli.OptionsTest

shortOpts/longOpts/requiredOpts/optionGroups

org.apache.commons.cli.CommandLineTest

args = new LinkedList();/options = new ArrayList();

args用于接收无法处理的参数

org.apache.commons.cli.DefaultParserTest

org.apache.commons.cli.ParserTestCase

Option currentOption—-The last option parsed.(表示期望解析参数的option)

parse流程

handleToken

currentOption.addValueForProcessing

processValue

add(value);

handleUnknownToken

cmd.addArg(token);